Initial commit

src/gcc_matcher.jsontemplate

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+{
+    "problemMatcher": [
+        {
+            "owner": "gcc-problem-matcher",
+            "pattern": [
+                {
+                    "regexp": "^${{ BASE }}\/?(.*?):(\\d+):(\\d*):?\\s+(?:fatal\\s+)?(warning|error):\\s+(.*)$",
+                    "file": 1,
+                    "line": 2,
+                    "column": 3,
+                    "severity": 4,
+                    "message": 5
+                }
+            ]
+        }
+    ]
+}

src/index.js

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+const path = require('path');
+const fs = require('node:fs');
+//const core = require('@actions/core');
+
+// C:\Users\ => C\:\\Users\\
+const escapeRegExp = (s) =>
+	s.replace(/[:.*+?^${}()|\/[\]\\]/g, "\\$&");
+
+
+// ${{ key }}, ${{var}}, ${{ aggqq43g3qg4 }}
+const variable = (key) =>
+	new RegExp("\\${{\\s*?" + key + "\\s*?}}", "g");
+
+
+// default value set in /action.yml
+// const root = core.getInput('root', { required: false });
+root = '/tmp/workspace';
+
+const templatePath = path.join(__dirname, "gcc_matcher.jsontemplate");
+
+const parsed = 
+	fs.readFileSync(templatePath, "ascii")
+		.replace(variable("BASE"), escapeRegExp(root));
+
+const matcherPath = path.join(__dirname, "gcc_matcher.json");
+
+fs.writeFileSync(matcherPath, parsed);
+
+console.log('::add-matcher::' + matcherPath);
+
+/* for testing */ 
+exports.escapeRegExp = escapeRegExp
+exports.variable = variable;